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Reserves for Insurance Claims and Claim Expenses - Reconciliation of Reserve Balances for Insurance Claims and Claim Expense (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Beginning balance $ 152,071 $ 123,974
Less reinsurance recoverables (32,260) (27,514)
Beginning balance, net of reinsurance recoverables 119,811 96,460
Claims and claim expenses incurred:    
Current year 88,584 71,532
Prior years (52,440) (57,241)
Total claims and claim expenses incurred (4) 36,144 14,291
Claims and claim expenses paid:    
Current year 280 180
Prior years 12,607 4,265
Reinsurance terminations (1,964) 0
Total claims and claim expenses paid 10,923 4,445
Reserve at end of period, net of reinsurance recoverables 145,032 106,306
Add reinsurance recoverables 35,315 29,214
Ending balance 180,347 135,520
Current year case reserves 77,200 63,200
Current year IBNR 9,800 7,000
Prior year case reserves 43,200 49,800
Prior year, IBNR 8,100 $ 6,300
Reinsurance Policy, Type [Axis]: 2016 QSR Transactions    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Less reinsurance recoverables (1,100)  
Reinsurance Policy, Type [Axis]: 2016, 2018 and 2021 QSR Transaction    
Ceded Credit Risk [Line Items]    
Reinsurance ceded claims and claims (benefits) expenses, termination fee 300  
Reinsurance Policy, Type [Axis]: QSR Transactions    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Less reinsurance recoverables (31,200)  
Claims and claim expenses paid:    
Add reinsurance recoverables $ 35,300